Perovskite energy funnels for efficient white emission.

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Chemistry

Background:

• Doping CsPbCl3 nanocrystals (NCs) with Mn2+ results in strong orange emission.
• Mn2+ doping in CsPbBr3 NCs shows impaired emission due to back energy transfer.
• Multiple-quantum-well (MQW) structures in perovskites can facilitate energy transfer for high photoluminescence quantum yield (PLQY).

Purpose of the Study:

• To develop an effective method for doping Mn2+ into Br-based perovskite MQW structures.
• To investigate the energy transfer dynamics in Mn2+-doped perovskite MQWs.
• To achieve high-efficiency white lighting using Mn2+-doped perovskite materials.

Main Methods:

• An Ag+ assisted doping strategy was employed for Mn2+ incorporation into Br-based perovskite MQWs.
• Simultaneous formation of nanoplatelets (NPLs) and NCs within the MQW structure.
• Optimization of experimental parameters, including reaction time and Pb-to-Mn feed ratio.

Main Results:

• Efficient energy transfer from higher bandgap NPLs to lower bandgap NCs, and subsequently to Mn2+ dopants.
• Achieved a white lighting solution with a high PLQY of up to 98%.
• Demonstrated successful Mn2+ doping into CsPbBr3 host material within an MQW structure.

Conclusions:

• The Ag+ assisted doping method enables efficient Mn2+ incorporation into CsPbBr3 MQW perovskites.
• The MQW structure facilitates efficient energy transfer pathways, enhancing luminescence.
• This work presents a promising pathway for developing next-generation white lighting applications.